Here will include a list of some of the most successful and great sites I know of. It's a little empty at the moment but I'll add non-Pivot related stuff later on.

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DarkDemon.org - Probably the most successful Pivot forum around.

WebShizzle.co.nr - This site is hilarious! Gray's awesome site has everything : D

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While you see all those sites, don't forget mine haha : D